惊奇
发表于 2025-3-25 06:33:39
On Stromatolite Lamination,ries of modern stromatolite-building biota from the Bahama Carbonate Platform, Great Sippewissett Salt Marsh of New England, and Hamelin Pool, Shark Bay, Australia. The findings are compared with fossil evidence preserved in silicified Mesoproterozoic stromatolites of the Gaoyuzhuang Formation, nort
corporate
发表于 2025-3-25 09:40:20
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Aphorism
发表于 2025-3-25 14:36:11
Bacterial Roles in the Precipitation of Carbonate Minerals,active or passive precipitation. In active precipitation, solid carbonate is localised by ionic exchange through the cell membrane. In passive precipitation, processes such as ammonification, dissimilatory nitrate reduction, degradation of urea or uric acid, and sulphate reduction lead to carbonate
Bravura
发表于 2025-3-25 19:49:29
Bacterially Induced Microscale and Nanoscale Carbonate Precipitates, They are particularly common in peloids, stromatolites, and hot-water travertines. The peculiar crystal morphologies they produce can be duplicated in the laboratory. Nanobacteria are much smaller forms, spheroids 0.03–0.1 µm in diameter. A quantitative census of nanobacterial bodies in limestones
争吵
发表于 2025-3-25 20:08:32
Calcification in Cyanobacteria,ake and the existence of a suitable sheath. Physicochemical precipitation under high levels of supersaturation leads to the dense encrustation of the filaments, forming a solid micrite tube, while photosynthetic bicarbonate uptake in less supersaturated waters can lead to micrite precipitation withi
Intrepid
发表于 2025-3-26 03:54:23
Cyanobacteria: Architects of Sedimentary Structures,of organo-sedimentary structures. Today, cyanobacteria dominate extreme environments where they participate in sediment production, construction and destruction, and leave characteristic, often species-specific, traces of their activities. Microbial ecosystems at the sediment-water interface are bui
沙漠
发表于 2025-3-26 06:39:35
Fungi and Sediments,ontributing to rock dissolution and neoformation of crystals, mainly oxalates and carbonates. Fungi contribute to the accumulation of manganese and iron as desert varnish and play a major role in the calcium cycle inside calcretes and carbonate soils in arid zones. Fungi constitute an important part
感激小女
发表于 2025-3-26 11:26:06
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Employee
发表于 2025-3-26 15:10:44
Carbon Isotopes and Microbial Sediments,c signatures of both the primary microbial biomass and of the carbonate of the surrounding sediment matrix. This is true for present-day stromatolites as well as for their fossil counterparts, which can preserve these signatures with a minor diagenetic overprint for billions of years. While the isot
Largess
发表于 2025-3-26 17:31:20
Sulphur Isotopes and Microbial Sulphur Cycling in Sediments,uring the the formation of H.5 by microbial sulphate reduction. The isotopic composition of the H.5 being produced at any instant varies with rates of oxidation recycling of sulphate (which determine the maximum fractionation) and rates of sulphate supply relative to rates of sulphate reduction (whi